20.—(1) The Secretary of State or the Welsh Ministers may approve for the purposes of these Regulations codes of practice issued for the purpose of giving practical guidance to persons engaged in any activity that may result in discharging hazardous substances or non-hazardous pollutants on the steps they should take to prevent them from entering groundwater.
(2) The Agency must take into account whether or not such a code of practice is being or is likely to be complied with before taking any enforcement action under these Regulations.
(3) A code of practice must be publicised as the Secretary of State or the Welsh Ministers see fit.